Ability to vote for clan wars
Whenever we want to start a clan battle, we like to know if everyone is ready for a war. The problem is that not everyone is online to let us know if they're ready because they could be upgrading their elixir collectors, or defenses, which makes the clan vulnerable. So I think the leaders and co-leaders should be able to write a message (in order to write what time we want war to start) that has the ability to let it's members give a 'yes' or 'no' vote (with possibly an option of letting the members write a reason why they voted 'no'). The message itself won't decide whether or not the clan war starts, it's only there to keep the members in check as well as influence the decision of the war.